split horizon(split h&-rī´z&n) (n.) A routing technique that eliminates the chance of a routing scheme creating routing loops, effectively making routing more efficient. When a router in a network with only one data path receives a data packet, it does not send routing information back along the path on which the packet traveled (i.e., to an adjacent router); it only sends the information forward so that there is no possibility of the packet being routed back along the path it originally traveled.
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